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Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

CVE-2026-57220RabbitMQ: Stream listener does not enforce configured frame-size limit during authentication, permitting unauth'd mem-exhaust DoS

High 7.5

In plain English

A high-severity resource allocation without limits in rabbitmq-server from rabbitmq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 54.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

RabbitMQ is a messaging and streaming broker. Prior to 4.2.6, the RabbitMQ stream listener does not enforce the configured stream frame-size limit while assembling frames during authentication and before Tune negotiation, allowing an unauthenticated remote client to declare oversized frame lengths and consume broker memory in rabbit_stream_core. This issue is fixed in version 4.2.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-57220
Ubuntu:24.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-57220
Ubuntu:26.04:LTSrabbitmq-serverno fix listedUBUNTU-CVE-2026-57220
Ubuntu:26.10rabbitmq-serverno fix listedUBUNTU-CVE-2026-57220

Affected products (as reported)

VendorProductVersions
rabbitmq rabbitmq-server >= 4.2.0, < 4.2.6

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References